For the last few weeks I've had on and off really painful stomach cramps, bloating, diarrhea, constipation, terrible piles and thinking about it I've also had lower back pain. Could I have developed a sudden allergy? I haven't changed my diet or anything and eat relatively healthily - lots of fruit and veg and unprocessed foods. I know a GP appointment is the obvious answer but I find my GP so dismissive and unconcerned whenever I go so wondered if anyone had had similar so I feel prepared should I be brushed off.